package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MemberSignature;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    //切入点，对哪些类的哪些方法进行拦截
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){
    }

    //前置通知，在sql语句执行前
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始填充。。。。");

        //获取当前被拦截到的方法数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取方法上的注解对象
        OperationType operationType = autoFill.value();//获取数据库操作类型

        //获取到当前被拦截到的方法参数--实体对象
        Object[] args = joinPoint.getArgs();
        if(args ==null || args.length ==0){
            return;
        }
        Object entity = args[0];

        //准备赋值的数据，
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据当前不同的操作类型，为对应的属性通过反射赋值
        if (operationType == OperationType.INSERT){
            //为四个公公字段进行赋值
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);

                //通过反射为对象进行赋值
                setCreateTime.invoke(entity, now);
                setCreateUser.invoke(entity, currentId);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity, currentId);
            }catch (Exception e){
                e.printStackTrace();
            }
        } else if (operationType == OperationType.UPDATE){
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);

                //通过反射为对象进行赋值

                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity, currentId);
            }catch (Exception e){
                e.printStackTrace();
            }
        }

    }
}
